diff --git a/include/podio/detail/RelationIOHelpers.h b/include/podio/detail/RelationIOHelpers.h
index cf942b96a..b0fe1b60d 100644
--- a/include/podio/detail/RelationIOHelpers.h
+++ b/include/podio/detail/RelationIOHelpers.h
@@ -28,7 +28,7 @@ namespace podio::detail {
 /// @param id The ObjectID of the element that we are currently looking for
 template <typename T, typename InterfaceType>
 void tryAddTo(T, std::vector<InterfaceType>& relElements, const podio::CollectionBase* coll, const podio::ObjectID id) {
-  if (auto typedColl = dynamic_cast<const T::collection_type*>(coll)) {
+  if (auto typedColl = dynamic_cast<const typename T::collection_type*>(coll)) {
     const T tmp = (*typedColl)[id.index];
     relElements.emplace_back(tmp);
   }
@@ -87,7 +87,7 @@ void addMultiRelation(std::vector<RelType>& relElements, const podio::Collection
   if constexpr (podio::detail::isInterfaceType<RelType>) {
     addInterfaceToMultiRelation(relElements, coll, id);
   } else {
-    const auto* typeColl = static_cast<const RelType::collection_type*>(coll);
+    const auto* typeColl = static_cast<const typename RelType::collection_type*>(coll);
     relElements.emplace_back((*typeColl)[id.index]);
   }
 }
@@ -111,7 +111,7 @@ void addMultiRelation(std::vector<RelType>& relElements, const podio::Collection
 /// @param id The ObjectID of the element that we are currently looking for
 template <typename T, typename InterfaceType>
 void tryAssignTo(T, InterfaceType*& relation, const podio::CollectionBase* coll, const podio::ObjectID id) {
-  if (const auto* typeColl = dynamic_cast<const T::collection_type*>(coll)) {
+  if (const auto* typeColl = dynamic_cast<const typename T::collection_type*>(coll)) {
     relation = new InterfaceType((*typeColl)[id.index]);
   }
 }
@@ -168,7 +168,7 @@ void addSingleRelation(RelType*& relation, const podio::CollectionBase* coll, co
   if constexpr (podio::detail::isInterfaceType<RelType>) {
     addInterfaceToSingleRelation(relation, coll, id);
   } else {
-    const auto* typeColl = static_cast<const RelType::collection_type*>(coll);
+    const auto* typeColl = static_cast<const typename RelType::collection_type*>(coll);
     relation = new RelType((*typeColl)[id.index]);
   }
 }